Petrol lines disintegrate when fuel is stored in the trimmer for long periods of time. These can be obtained from any small tool repair store. Just remove them and install new ones. They just slip through the holes in the tank, re-attach the fuel filter on the supply line. Make sure that the line is long enough so that the filter rests on the back/bottom corner of the tank. Be sure that the lines are attached to the proper ports on the carb>

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The line off the top of the primer bulb goes to the top of the carburetor.
The line on the bottom of the primer bulb goes to the fitting on the
center of the fuel tank and the line off the side of the fuel tank goes
to the bottom of the carburetor.

This is likely a mechanical problem caused by either 1. A serious imbalance with the cutter attatched to it 2. The engine is failing and the main crankshaft bearings are worn causing crankshaft "wobble" setting up the heavy vibration you speak of.

Any local small engine service shop should have these parts in stock. Its called a 'primer bulb'.
Determine if the primer bulb is part of the carb or sperate from the carb with fuel lines connecting them. If seperate remember how the 2 lines get connected when you remove the bulb and replace with a new one. If a part of the carb...
You need to determine if the carb is a Zama or Walbro. It will have the name stamped on the carb. All Zama carbs use the same bulb. Walbro has a small and large bulb.
It would be worth while to install a new carb kit while you have the carb off and apart

Hi there, takes a bit of working out without a manual, but try this....take bottom half of trimmer line spool off, get piece of spool line approx 60 cm, long and thread through centre holes, ( bit fiddly but ) pull line through until you have equal length on both sides, dont try and wind it up onto the spool, just put ends of line through outside cover holes, then lock spool in place in other half. now simply wind the knob at the end and the line should retract into the spool., sounds complicated but really isnt, best regards and good luck, Philbee